feat(LEDC): Add Gamma Fade support and enhance auto channel/timer selection for multi-group #4390

Job	Run time
Generate matrix	4s
Push event file	3s
Build (validation, esp32s2) / Build validation tests for esp32s2	5m 49s
Build (validation, esp32s3) / Build validation tests for esp32s3	6m 33s
Build (validation, esp32c3) / Build validation tests for esp32c3	4m 1s
Build (validation, esp32c6) / Build validation tests for esp32c6	4m 37s
Build (validation, esp32p4) / Build validation tests for esp32p4	4m 9s
Build (validation, esp32h2) / Build validation tests for esp32h2	3m 33s
Build (validation, esp32) / Build validation tests for esp32	5m 39s
Hardware	0s
QEMU	-1s
	34m 27s

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